one of the scientists on the panel was this man, dennis paustenbach. the "newshour" and the center for public integrity learned the company he ran, chemrisk, had been hired by pacific gas and electric during the lawsuit. at the time, the most compelling scientific study that linked chromium 6 in drinking water to cancer came from china in 1987. it studied villagers in liaoning province who lived near a chromium ore smelter and drank tainted water for years. the lead author-- a dr. zhang jiandong. found they had increased rates of stomach cancer. acting on behalf of its client p.g.&e., chemrisk paid zhang to redo his study. paustenbach offered this explanation before the california senate. >> after he saw the questions that we raised about the analysis, he went back and examined and said, "of course not, it can't be true. my original conclusions don't make sense." >> reporter: the revised study reversed the original conclusion that chromium 6 was the likely cause of the villagers developing cancer. scientists at the california environmental protection a